http://www.cnr.it/ontology/cnr/individuo/prodotto/ID196021
Transition from order to chaos, and density limit, in magnetized plasmas (Articolo in rivista)
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- Transition from order to chaos, and density limit, in magnetized plasmas (Articolo in rivista) (literal)
- Anno
- 2012-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1063/1.4745851 (literal)
- Alternative label
A. Carati; M. Zuin; A. Maiocchi; M. Marino; E. Martines; L. Galgani (2012)
Transition from order to chaos, and density limit, in magnetized plasmas
in Chaos (Woodbury N.Y.); American Institute Of Physics (AIP), Melville (Stati Uniti d'America)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- A. Carati; M. Zuin; A. Maiocchi; M. Marino; E. Martines; L. Galgani (literal)
- Pagina inizio
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- Article Number: 033124
La rivista è pubblicata anche online con ISSN 1089-7682 e CD-rom ISSN 1527-2443 (AMER INST PHYSICS, CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA) (literal)
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- http://chaos.aip.org/resource/1/chaoeh/v22/i3/p033124 (literal)
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- 1 Università degli Studi di Milano, Milano, Italy;
2 Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione, Padova, Italy.
(A. Carati 1, M. Zuin 2, A. Maiocchi 1, M. Marino 1, E. Martines 2, L. Galgani 1) (literal)
- Titolo
- Transition from order to chaos, and density limit, in magnetized plasmas (literal)
- Abstract
- It is known that a plasma in a magnetic field, conceived microscopically as a system of point charges, can exist in a magnetized state, and thus remain confined, inasmuch as it is in an ordered state of motion, with the charged particles performing gyrational motions transverse to the field. Here, we give an estimate of a threshold, beyond which transverse motions become chaotic, the electrons being unable to perform even one gyration, so that a breakdown should occur, with complete loss of confinement. The estimate is obtained by the methods of perturbation theory, taking as perturbing force acting on each electron that due to the so-called microfield, i.e., the electric field produced by all the other charges. We first obtain a general relation for the threshold, which involves the fluctuations of the microfield. Then, taking for such fluctuations, the formula given by Iglesias, Lebowitz, and MacGowan for the model of a one component plasma with neutralizing background, we obtain a definite formula for the threshold, which corresponds to a density limit increasing as the square of the imposed magnetic field. Such a theoretical density limit is found to fit pretty well the empirical data for collapses of fusion machines. (literal)
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